My 61 year old dad was diagnosed with stage 4 adenocarcinoma in the colon. The doctor said it has matastisized. He's been getting rounds of aggressive chemo every two weeks since November . What I wanna know is how long is a persons lifespan with this type of cancer? I still have hope that he will get better and he's got such a strong will to live but I can't help but worry about the fact that it's stage 4. Anyone ou...